//题目：#if #ifdef 和#ifndef 的综合应用。
#include<stdio.h>
#define MAX
#define MAXIMUM(x,y) (x>y)?x:y
#define MINIMUM(x,y) (x>y?y:x)
void main()
{
    int a=10,b=20;
    #ifdef MAX
    printf("\40:The larger one is %d\n",MAXIMUM(a,b));
    #else
    printf("\40:The lower one is %d\n",MINIMUM(a,b));
    #endif

    #ifndef MIN
    printf("\40:The lower one is %d\n",MINIMUM(a,b));
    #else
    printf("\40:The larger one is %d\n",MAXIMUM(a,b));
    #endif

    #undef MAX
    #ifdef MAX
    printf("\40:The larger one is %d\n",MAXIMUM(a,b));
    #else
    printf("\40:The lower one is %d\n",MINIMUM(a,b));
    #endif

    #define MIN
    #ifndef MIN
    printf("\40:The lower one is %d\n",MINIMUM(a,b));
    #else
    printf("\40:The larger one is%d\n",MAXIMUM(a,b));
    #endif
    

}